Insulator tester unit



FIG. 1 is a front and bottom left perspective view of an insulator testunit showing our new design;

FIG. 2 is a front and top left perspective view thereof in an openposition;

FIG. 3 is a top plan view of FIG. 2;

FIG. 4 is a front elevational view of FIG. 2;

FIG. 5 is a rear elevational view of FIG. 2;

FIG. 6 is a left side elevational view of FIG. 2;

FIG. 7 is a top and right side perspective view of FIG. 2;

FIG. 8 is a bottom plan view of FIG. 2.

The ornamental design for an insulator tester unit, as shown anddescribed.